During a well-child exam of a 13-year-old male, small testicles with pubic and axillary hair are noted. To further evaluate, which question is most pertinent?

During a well-child exam of a 13-year-old male, small testicles with pubic and axillary hair are noted. To further evaluate, which question is most pertinent?

• A. Alcohol and tobacco use
• B. Changes in voice
• C. Increase in height and weight
• D. Participation in sports

Answer: (D)

In boys, testicular enlargement is the first sign of true puberty (gonadarche) and should rise in step with other secondary sexual characteristics like pubic and axillary hair. When you see small testicles but developed pubic/axillary hair, you should consider whether external sources of androgens are influencing development, in addition to asking about intrinsic pubertal progression. Asking about participation in sports is most pertinent because anabolic steroids and other performance-enhancing compounds are sometimes used by athletes to boost performance. These exogenous androgens suppress the normal hypothalamic-pituitary-gonadal axis, leading to testicular atrophy (smaller testes) even while secondary sexual characteristics like hair continue to develop. This directly explains the discrepancy seen in this exam finding. Alcohol and tobacco use is important for overall health but doesn’t specifically account for the testicular size relative to hair. Changes in voice could indicate androgen exposure, but exogenous steroids most directly tie to testicular atrophy in this context. Increases in height and weight are part of puberty but don’t address the abnormal size of the testes with concurrent hair development. Therefore asking about participation in sports to assess for anabolic steroid use is the most relevant next question.

In boys, testicular enlargement is the first sign of true puberty (gonadarche) and should rise in step with other secondary sexual characteristics like pubic and axillary hair. When you see small testicles but developed pubic/axillary hair, you should consider whether external sources of androgens are influencing development, in addition to asking about intrinsic pubertal progression.

Asking about participation in sports is most pertinent because anabolic steroids and other performance-enhancing compounds are sometimes used by athletes to boost performance. These exogenous androgens suppress the normal hypothalamic-pituitary-gonadal axis, leading to testicular atrophy (smaller testes) even while secondary sexual characteristics like hair continue to develop. This directly explains the discrepancy seen in this exam finding.

Alcohol and tobacco use is important for overall health but doesn’t specifically account for the testicular size relative to hair. Changes in voice could indicate androgen exposure, but exogenous steroids most directly tie to testicular atrophy in this context. Increases in height and weight are part of puberty but don’t address the abnormal size of the testes with concurrent hair development. Therefore asking about participation in sports to assess for anabolic steroid use is the most relevant next question.